UnsupportedOperationException with BufferingClientHttpRequestFactory in HttpComponentsClientHttpRequest body

[mlasotaa]

This issue is related to #32023.
Following the recommendation there, I added BufferingClientHttpRequestFactory to my RestTemplate, but it didn’t change anything.

`

@Bean
public RestTemplate restTemplate() {
    CloseableHttpClient httpClient = HttpClients.custom()
            .addRequestInterceptorLast((HttpRequest request,
                                        EntityDetails entityDetails,
                                        HttpContext context) -> {

                HttpEntity httpEntity = ((BasicClassicHttpRequest) request).getEntity();
                try {
                    // FIXME – After upgrading Spring from 5.7.x to 6.2.9, HttpEntity#getContent is no longer
                    // implemented and now consistently throws an exception (even when the request is wrapped
                    // in a BufferingClientHttpRequestFactory). This breaks our internal request-body logging.
                    // Current workaround: cache the body manually before this point so that HttpEntity is
                    // backed by non-null content.
                    System.out.println("request body " + EntityUtils.toString(httpEntity));
                } catch (UnsupportedOperationException e) {
                    System.out.println("request body workaround" + EntityUtils.toString(cacheHttpEntity(httpEntity)));
                    e.printStackTrace();
                }
            })
            .build();

    HttpComponentsClientHttpRequestFactory factory = new HttpComponentsClientHttpRequestFactory(httpClient);
    return new RestTemplate(new BufferingClientHttpRequestFactory(factory));
}

`

My Workaround

`

// Temporal solution

private static HttpEntity cacheHttpEntity(HttpEntity entity) {
    try {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        entity.writeTo(baos);
        return new ByteArrayEntity(
                baos.toByteArray(),
                ContentType.parse(entity.getContentType()));
    } catch (IOException exception) {
        return entity;
    }
}`

I'm leaving a link to my GitHub repository with the entire demo project.
https://github.com/mlasotaa/spring-6-2-9-rest-template/blob/master/src/main/java/com/example/demo/RestTemplateConfiguration.java

Is there anything else I can do to get access to the body in my custom logger without additional creating ByteArrayEntity?